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javax.xml.xpath

Interface XPathFunction

public interface XPathFunction
XPathFunction provides access to XPath functions.

Functions are identified by QName and arity in XPath.

Since:
1.5

Method Summary

Object
evaluate(List<E> args)
Evaluate the function with the specified arguments.

Method Details

evaluate

public Object evaluate(List<E> args)
            throws XPathFunctionException
Evaluate the function with the specified arguments.

To the greatest extent possible, side-effects should be avoided in the definition of extension functions. The implementation evaluating an XPath expression is under no obligation to call extension functions in any particular order or any particular number of times.

Parameters:
args - The arguments, null is a valid value.
Returns:
The result of evaluating the XPath function as an Object.
Throws:
XPathFunctionException - If args cannot be evaluated with this XPath function.
Usages and Demos :

View More Examples of evaluate(List args)
   1: import javax.xml.namespace.QName;
   2: import javax.xml.xpath.XPathFunction;
   3: import javax.xml.xpath.XPathFunctionException;
   4:         ...
   5:                 int arity = args.size();
   6:         XPathFunction function = resolver.resolveFunction(qname, arity);
   7:         if (function != null)
   8:         ...
   9:                   {
  10:                     return function.evaluate(values);
  11:                   }

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